<template>
	<view>
		<!-- 使用自定义搜索组件 -->
		<!-- <my-search :bgcolor="'#FF0000'" :radius="5"></my-search> -->
		<my-search @click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{ height: wh + 'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['view-scroll-view-item',i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题 -->
					<view class="cate-lv2-title">
						/ {{item2.cat_name}} /
					</view>
					
					<!-- 三级分类 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的item项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon" mode=""></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
	
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],	
		data() {
			return {
				//当前设备可用的高度
				wh : 0,
				cateList: [], //左边分类列表
				active: 0 ,//默认激活项
				cateLevel2: [] ,//二级分类列表
				scrollTop: 0 //默认滚动条高度
			};
		},
		async onLoad() {
			const sysInfo =await uni.getSystemInfoAsync() //获取手机各种参数
			this.wh = sysInfo[1].windowHeight - 50 //获取屏幕的可用高度 减去 搜索框的高度	
			this.getCateList() //获取左边分类列表
		},
		methods : {
			//获取分类列表
			async getCateList () {
				const {data: res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200){
					return uni.$showMsg()
				}
				this.cateList = res.message
				
				//为二级分类复制
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i) { //切换左边分类 
				this.active = i
				
				//重新为二级分类复制
				this.cateLevel2 = this.cateList[i].children
				//将滚动条移动到顶端
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item) { //跳转到商品列表页面
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			gotoSearch() {
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
			

		}
		
		
	}
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;
	
	.left-scroll-view {
		width: 120px;
		.view-scroll-view-item {
			background-color: #F7F7F7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			
			&.active {
				background-color: #FFFFFF;
				position: relative;
				
				&::before {
					content: '';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #C00000;
					position: absolute;
					top: 50%;
					transform: translateY(-50%);
					left: 0;
				}
			}
		}
	}
}

.cate-lv2-title {
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}

.cate-lv3-list {
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item{
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		image {
			width: 60px;
			height: 60px;
		}
		text {
			font-size: 12px;
		}
	}
}
</style>
